cc: Make LayerTreeHost a protected Layer member.

third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/compositing/PaintArtifactCompositor.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/playback/display_item_list.h"
@@ skipping 476 matching lines @@
     dummyLayer->SetEffectTreeIndex(effectNode.id);
     dummyLayer->SetScrollTreeIndex(kRealRootNodeId);
 }
 
 } // namespace
 
 void PaintArtifactCompositor::update(const PaintArtifact& paintArtifact)
 {
     DCHECK(m_rootLayer);
 
-    cc::LayerTreeHost* host = m_rootLayer->layer_tree_host();
+    cc::LayerTree* layerTree = m_rootLayer->GetLayerTree();
 
-    // The host will be null after detaching and this update can be ignored.
+    // The tree will be null after detaching and this update can be ignored.
     // See: WebViewImpl::detachPaintArtifactCompositor().
-    if (!host)
+    if (!layerTree)
         return;
 
     if (m_extraDataForTestingEnabled)
         m_extraDataForTesting = wrapUnique(new ExtraDataForTesting);
 
-    setMinimalPropertyTrees(host->GetLayerTree()->property_trees(), m_rootLayer->id());
+    setMinimalPropertyTrees(layerTree->property_trees(), m_rootLayer->id());
 
     m_rootLayer->RemoveAllChildren();
     m_rootLayer->set_property_tree_sequence_number(kPropertyTreeSequenceNumber);
     m_rootLayer->SetTransformTreeIndex(kSecondaryRootNodeId);
     m_rootLayer->SetClipTreeIndex(kSecondaryRootNodeId);
     m_rootLayer->SetEffectTreeIndex(kSecondaryRootNodeId);
     m_rootLayer->SetScrollTreeIndex(kRealRootNodeId);
 
-    PropertyTreeManager propertyTreeManager(*host->GetLayerTree()->property_trees(), m_rootLayer.get());
-    propertyTreeManager.setDeviceScaleFactor(host->GetLayerTree()->device_scale_factor());
+    PropertyTreeManager propertyTreeManager(*layerTree->property_trees(), m_rootLayer.get());
+    propertyTreeManager.setDeviceScaleFactor(layerTree->device_scale_factor());
 
     m_contentLayerClients.clear();
     m_contentLayerClients.reserveCapacity(paintArtifact.paintChunks().size());
     for (const PaintChunk& paintChunk : paintArtifact.paintChunks()) {
         gfx::Vector2dF layerOffset;
         scoped_refptr<cc::Layer> layer = layerForPaintChunk(paintArtifact, paintChunk, layerOffset);
 
         int transformId = propertyTreeManager.compositorIdForTransformNode(paintChunk.properties.transform.get());
         int scrollId = propertyTreeManager.compositorIdForScrollNode(paintChunk.properties.scroll.get());
         int clipId = propertyTreeManager.compositorIdForClipNode(paintChunk.properties.clip.get());
         int effectId = propertyTreeManager.switchToEffectNode(*paintChunk.properties.effect.get());
 
         propertyTreeManager.updateScrollOffset(layer->id(), scrollId);
 
         layer->set_offset_to_transform_parent(layerOffset);
 
         m_rootLayer->AddChild(layer);
         layer->set_property_tree_sequence_number(kPropertyTreeSequenceNumber);
         layer->SetTransformTreeIndex(transformId);
         layer->SetClipTreeIndex(clipId);
         layer->SetEffectTreeIndex(effectId);
         layer->SetScrollTreeIndex(scrollId);
 
         // TODO(jbroman): This probably shouldn't be necessary, but it is still
         // queried by RenderSurfaceImpl.
-        layer->Set3dSortingContextId(host->GetLayerTree()->property_trees()->transform_tree.Node(transformId)->sorting_context_id);
+        layer->Set3dSortingContextId(layerTree->property_trees()->transform_tree.Node(transformId)->sorting_context_id);
 
         layer->SetShouldCheckBackfaceVisibility(paintChunk.properties.backfaceHidden);
 
         if (m_extraDataForTestingEnabled)
             m_extraDataForTesting->contentLayers.append(layer);
     }
 
     // Mark the property trees as having been rebuilt.
-    host->GetLayerTree()->property_trees()->sequence_number = kPropertyTreeSequenceNumber;
-    host->GetLayerTree()->property_trees()->needs_rebuild = false;
+    layerTree->property_trees()->sequence_number = kPropertyTreeSequenceNumber;
+    layerTree->property_trees()->needs_rebuild = false;
 }
 
 } // namespace blink